The cell walls of diatoms are embedded with

Options :
  1. Lead
  2. Silica
  3. Raphides
  4. Druses

Answer and Explanation :-

Answer: Option 2


The cell wall of diatoms is called frustule and is impregnated with silica

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I see at last that all the knowledgeI wrung from the darkness-that the darkness flung me-Is worthless as ignorance: nothing comes from nothing,The darkness from the darkness. Pain comes from the darknessAnd we call it wisdom. It is pain.
-Randall Jarrell The Complete Poems